Tongues has never been for the benefit of the church. See I cor 14:22
Also the use of the word tongue is not always a reference to a supernatural gift from God. Should it have been a supernatural gift from God Paul would have no need to correct it for he would be correcting God.
1 Corinthians 14:21 In the law it is written,
With men of other tongues and other lips will I speak unto this people; and yet for all that will they not hear me, saith the Lord.
22 Wherefore tongues are for a sign, not to them that believe, but to them that believe not: but prophesying serveth not for them that believe not, but for them which believe.
--This is just one of the purposes of tongues. It was for the unbelieving Jew. But it was always in the confines of the church. The spiritual gifts were given to the church--all of them.
--"this people" is Israel. They will not believe. The two verses are connected. It specifically refers to unbelieving Jews.
The context begins here, Paul writing to the church at Corinth, says:
1 Corinthians 12:1 Now
concerning spiritual gifts, brethren, I would not have you ignorant.
In verse 4 he explains that there are many kinds of gifts:
1 Corinthians 12:4 Now there are diversities of gifts, but the same Spirit.
In verse 10 he includes tongues as one of them:
1 Corinthians 12:10 To another the working of miracles; to another prophecy; to another discerning of spirits; to another
divers kinds of tongues; to another the interpretation of tongues:
--The languages were supernaturally given, as were the interpretation thereof.
A summary of the gifts are given here:
1 Corinthians 12:28 And God hath set some in the church, first apostles, secondarily prophets, thirdly teachers, after that miracles, then gifts of healings, helps, governments,
diversities of tongues.
--Notice that they are listed in order of importance: First, secondarily, thirdly, after that, then, and the last on the list is tongues, the least important gift of all.
In chapter 14 there seems to be a contrast between the gift of tongues and the gift of prophecy. The gift of tongues was not profitable because no one could understand it if there was no one to interpret. But prophecy edified.
All the gifts were to be used for the church. That was the emphasis of chapter 12. They were to work in unity together for the edification of the church.
Paul said:
1 Corinthians 14:18 I thank my God, I speak with tongues more than ye all:
--Paul used this gift a lot. He was a missionary and started many churches. He spoke in the synagogues often. It was a gift for the unbelieving Jew.
But it was also a gift used to verify his apostolic office that he was indeed an apostle, and that his message was from God (Heb.2:3,4).
1 Corinthians 14:27 If any man speak in an unknown tongue, let it be by two, or at the most by three, and that by course; and let one interpret.
--These are instructions to the first century early church, particularly here at Corinth, how to use this gift properly
in the church. It was a gift to edify the church. It could be used within biblical guidelines, but prophecy was better. Even prophecy had its limitations.